Jan 22 2014:
"London bridge is falling down" is a traditional nursely rhyme.
Of course It has other meaning, but I think there was no evidence to support it.

It is one of the belief that childrens were buried in the bridge`s foundation as a sacrifice to a specific water-spanning gods, and the rhyme relates to the construction of London Bridge by Olaf Ⅱof Norway in 1009.
It is also one theory "My fair Lady" referred to Matilda of Scotland who was responsible for the construction.